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Objectives In the non-sedated pediatric outpatient setting, the Wave-CAIPI SWI is compared to the standard SWI, estimated scan time, image noise, artifacts, visualization of normal anatomy, and visualization of pathology. Materials and methods Twenty-eight children underwent three-tesla brain MRI, including a three-dimensional SWI sequence followed by a fast Wave-CAIPI SWI sequence for each subject, along with a standard three-dimensional SWI sequence. We rated all studies on a predetermined 5-point scale and used the Wilcoxon signed rank test to determine the difference between sequences' different sequences. Results Wave-CAIPI SWI provided a 78 percent and 67 percent reduction in estimated scan time using the 32- and 20-channel coils, respectively, corresponding to estimated scan time savings of 3. 5 minutes and 3 min, respectively. With wave SWI, image noise was rated higher in the central brain but not in the peripheral brain.
Source link: https://doi.org/10.1007/s00247-021-05273-8
The harmonic balance scheme has proven to be an accurate and accurate way to find periodic, as well as almost everyday, solutions to nonlinear ordinary differential equations. Aliasing occurs because Fourier coefficients of nonlinear terms in the governing equations are approximated by a discrete Fourier transformation. Understanding how aliasing occurs when the DFT is used is, therefore, is crucial in improving the harmonic balance method's accuracy. Lastly, a scheme for oversampling multiple frequency harmonic balance computations is developed and tested.
Source link: https://doi.org/10.1007/s10915-022-01776-0
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